| Sammanfattning: | In the Nizanda region, a botanically little known area located in the Isthmus of Tehuantepec, Juchitan District, Oaxaca (southern Mexico), the main plant communities were characterized, and a floristic inventory was prepared on the basis of our own collected material. Landscape heterogeneity in Nizanda determines the existence of seven vegetation types: gallery forest, thorn scrub, xeric scrub, savanna, dry tropical forest, semievergreen and semideciduous tropical forest, and aquatic and subaquatic vegetation. The floristic list includes a total of 746 species of vascular plants, distributed in 458 genera and 119 families. The 1,435 collection records were fed into a relational database, which allowed us to determine for each species the vegetation types where it was found. General vegetation patterns are discussed, together with their possible causes, as well as the relevance of the flora of Nizanda at the regional level.
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